Bug 257291

Summary: panic: deadlres_td_sleep_q: possible deadlock detected on 14.0-n248045-76fffd0a865 (in vt_kms_postswitch: sys/modules/drm-current-kmod/drivers/gpu/drm/linux_fb.c)
Product: Base System Reporter: Masachika ISHIZUKA <ish>
Component: kernAssignee: freebsd-bugs (Nobody) <bugs>
Status: Closed Works As Intended    
Severity: Affects Only Me CC: cy, emaste, grahamperrin, manu, zeising
Priority: --- Keywords: crash, needs-qa
Version: CURRENTFlags: koobs: maintainer-feedback?
koobs: maintainer-feedback?
koobs: mfc-stable13-
koobs: mfc-stable12-
koobs: mfc-stable11-
Hardware: Any   
OS: Any   
Attachments:
Description Flags
core.txt none

Description Masachika ISHIZUKA 2021-07-20 02:04:23 UTC 
Created attachment 226561 [details]
core.txt

On 14-curent n248045-76fffd0a865, panic occured.

% cat info.last 
Dump header from device: /dev/gpt/fbswap
  Architecture: amd64
  Architecture Version: 2
  Dump Length: 1568919552
  Blocksize: 512
  Compression: none
  Dumptime: 2021-07-20 00:35:20 +0900
  Hostname: carrot.ish.org
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 14.0-CURRENT #3 master-n248045-76fffd0a865-dirty: Sun Jul 18 20:38:04 JST 2021
    ishizuka@okra.ish.org:/usr/obj/usr/src/amd64.amd64/sys/SG_UDF2
  Panic String: deadlres_td_sleep_q: possible deadlock detected for 0xfffffe00cdc6b720 (find), blocked for 1802049 ticks

  Dump Parity: 3215715396
  Bounds: 1
  Dump Status: good

vmcore.1 was saved at https://www.ish.org/files/vmcore-n248045.1.xz (863 megabytes).
Comment 1 Emmanuel Vadot freebsd_committer freebsd_triage 2021-07-20 07:25:25 UTC 
The vt message is just a false message, this happens when we panic and switch console.
Comment 2 Ed Maste freebsd_committer freebsd_triage 2022-03-03 15:31:52 UTC 
Looks like stuck in NFS:
    0 3716 3711 1  52  0  22092   6004 nfs      D     -     0:07.85 [find]